Net supply apparatus for round balers

ABSTRACT

An agricultural baler for making cylindrical bales of crop material having a sledge assembly moveable between bale starting and full bale positions. The sledge assembly includes a plurality of rollers which cooperate with an apron to define a bale forming chamber. A dispensing mechanism is carried on the sledge assembly for dispensing sheet material, such as net or the like, into the bale forming chamber whereupon it is wrapped circumferentially around a cylindrical bale of crop material in the bale forming chamber. A net supply assembly is associated with the dispensing mechanism to provide net for feeding into the bale chamber via the dispensing mechanism. Included in the net supply assembly is a net brake for restraining the net during various parts of the wrapping process, e.g, cutting. The brake is operated in cooperation with a counter arrangement that includes an idler roll in continuous contact with the surface of the net supply roll.

CROSS REFERENCE TO RELATED APPLICATION

This is a division of U.S. Pat. No. 5,289,672, issued Mar. 1, 1994, Ser.No. 07/917,875, filed Jul. 23, 1992.

FIELD OF THE INVENTION

This invention relates generally to a baler for forming cylindricalbales of crop material, commonly referred to as a round baler. Moreparticularly, this invention pertains to an improved net supply assemblyfor round bale net wrapping apparatus.

BACKGROUND OF THE INVENTION

Prior art round balers generally have a bale forming chamber defined byan apron comprising an array of side-by-side belts, transverse slatstrained on chains, a plurality of rolls or a combination of thesevarious elements, e.g., rolls and belts. Crop material, such as hay, ispicked up from the ground, as the baler travels across the field, and isfed into a fixed or expandable chamber where it is rolled up to form acompact cylindrical hay package. While still inside the bale formingchamber in its compacted form, the outer surface of the package iswrapped with twine or web material, such as net, prior to ejecting thewrapped bale from the chamber onto the ground for subsequent handling.

Exemplary of prior art round balers of the general type mentioned aboveis the baler disclosed in U.S. Pat. No. 4,956,968 issued in the name ofK. R. Underhill on Sep. 18, 1990. In this baler an apron consisting of acombination of rolls and belts is used for bale formation. The baleralso includes a mechanism for supplying net to a dispensing assemblywhich in turn feeds the net material into the bale forming chamber forcircumferentially wrapping a formed cylindrical bale. The dispensingmechanism includes a net insertion arrangement having a grasping portionfor pulling net from the supply mechanism and inserting the free edge,commonly referred to as the tail, into the chamber. Subsequent towrapping, the net material is severed by a cutting device.

During various phases of the net feeding and wrapping operation in roundbalers of this general type a restraining force is applied to the net.This force varies in prior art devices from a substantial braking forceproviding a significant drag to hold the net under tension for cuttingto a minimal force to merely avoid unwanted feeding of slack caused byinertial forces due to the tendency of the supply rolls and/or the rollsalong the feed path of various systems to overrun. Examples of prior artdevices include the disclosure in U.S. Pat. No. 4,604,848, issued Aug.12, 1986, showing a braking rod continuously urged against the netsupply roll. This system also discloses an additional tensioning systemwhich incorporates the use of a moveable roller, about which the net iswrapped, for applying high web tensioning during cutting or tightwrapping. U.S. Pat. No. 4,697,402, issued Oct. 6, 1987, also shows theuse of a rod urged against a net supply roll in conjunction with a netfeed tensioning system.

Problems have been encountered in past attempts to accomplish, by simpleand reliable means, consistent net tension at a desirable level andduring a proper duration while the wrapping operation takes place. It iscrucial in net systems that both a continuous minimal tension be appliedto enhance the feeding function, and a greater uniform braking force besubsequently applied during net cutting. A drawback of many prior artsystems is the complexity of the mechanisms involved and the need tolocate such mechanisms in a confined area along the net feed pathbetween the net supply and the bale forming chamber.

SUMMARY OF THE INVENTION

An important object of the present invention is to provide improvedround baler net wrapping apparatus that enhances the reliability byconsistently providing for required net tension at a desirable level andduring a predetermined duration and thereby improves the overallperformance and serviceability.

In pursuance of this and other important objects the present inventionprovides for a new and unique improvement to round baler apparatushaving a chamber in which cylindrical bales of crop material are formed,a net supply assembly, means for dispensing net fed from the supplyassembly into the bale chamber for wrapping a bale formed in thechamber, means for severing the net after it has been wrapped around thebale, and control means operably connected to the net supply assemblyand the severing means so that the net is restrained from furtherfeeding from the net supply assembly under conditions where the bale hasbeen wrapped and the means for severing is operative. According to itsbroadest aspects the present invention contemplates that the net supplyassembly include means for receiving a roll of net, means through whichthe net is fed from the roll to the dispensing means to thereby reducethe diameter of the roll of net, and a unique net braking meanscomprising a transverse element having operative and inoperativepositions. More particularly, the net supply assembly further comprisesa mounting assembly including means for mounting the transverse elementfor bearing against the outer surface of the roll of net in itsoperative position to restrain the net from being fed and for mountingthe transverse element adjacent and free of contact with the outersurface in its inoperative position.

The foregoing and other objects, features and advantages of theinvention will appear more fully hereinafter from a consideration of thedetailed description which follows, in conjunction with the accompanyingsheets of drawings wherein one principal embodiment of the invention isillustrated by way of example. It is to be expressly understood,however, that the drawings are for illustrative purposes and are not tobe construed as defining the limits of the invention.

DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagrammatic side elevational view of a round baler in whichthe present invention is embodied and shows the elements in the balestarting position.

FIG. 2 is a diagrammatic side elevational view similar to FIG. 1 andshow the elements in the full bale position.

FIG. 3 is a detailed side elevation of the net wrapping apparatus of thebaler shown in FIGS. 1 and 2.

FIG. 4 is a side elevational view of the net roll supply system used inthe net wrapping apparatus shown in FIG. 3.

FIG. 5 is a detailed side elevational view of a control mechanism forthe net wrapping apparatus shown in FIG. 3.

FIG. 6 is also a detailed side elevational view of the control mechanismfor the net wrapping apparatus shown in FIG. 3 and shows the elements inan operational position different than shown in FIG. 5.

FIG. 7 is a view taken in the direction of arrows 7--7 in FIG. 1.

FIG. 8 is a view taken in the direction of arrows 8--8 in FIG. 6.

FIG. 9 is a detailed side elevational view of the net supply assembly ofthe present invention.

FIG. 10 is a view taken in the direction of arrows 10--10 in FIG. 9.

FIG. 11 is a view taken in the direction of arrows 11--11 in FIG. 10 andshows the parts of the brake element in detail.

FIG. 11a is similar to FIG. 11 and shows the brake element parts in adifferent operative position.

DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring now to the drawings for a more detailed description of thepreferred embodiment of the invention, FIG. 1 shows a round baler 10 ofthe type having an expandable chamber defined by belts and rollers, asgenerally disclosed in U.S. Pat. No. 4,956,958.

Round baler 10 incorporates the preferred embodiment of the presentinvention and includes a main frame 11 supported by a pair of wheels 12(only one shown). A tongue 13 is provided on the forward portion of mainframe 11 for connection to a tractor. Pivotally connected to the sidesof main frame 11 by a pair of stub shafts 15 is tailgate 14 which may beclosed (as shown in FIGS. 1 and 2) during bale formation or pivoted openabout stub shafts 15 to discharge a completed bale. A conventionalpickup 16, mounted on main frame 11, is supported by a pair of suitablewheels (not shown). Pickup 16 includes a plurality of fingers or tines17 movable in a predetermined path to lift crop material from the groundand deliver it rearwardly toward a floor roll 18, rotatably mounted onmain frame 11.

The bale forming chamber is defined partly by a sledge assembly 20comprising a plurality of rollers 21, 22, 23 extending transversely ofthe main frame 11 in the arcuate arrangement seen in FIGS. 1-3. Rollers21, 22, 23 are journalled at their respective ends in a pair of spacedapart roll carrying arms 24, 25 (see FIG. 7). These arms 24, 25 arepivotally mounted inside main frame 11 on stub shafts 26, 27 forproviding movement of sledge assembly 20 between the bale startingposition shown in FIG. 1 and the full bale position shown in FIG. 2.Rollers 21, 22, 23 are driven in a counter-clockwise direction as viewedin FIGS. 1-3 by conventional means (for example, chains and sprockets orgears) connected with a drive shaft 28 which is in turn connected to thepower-take-off of a tractor. A starter roll 30 is located adjacentroller 23 and is also driven counter-clockwise. A freely rotatable idlerroller 31, also carried by arms 24, 25, moves in an arcuate path withsledge assembly 20 as it moves between its bale starting position(FIG. 1) and full bale position (FIG. 2). Idler roller 31 is clearlydepicted in FIG. 7, as are rollers 21 and 23, also.

The bale forming chamber is further defined by a conventional apron 32comprising a plurality of continuous side-by-side belts supported byguide rolls 33, 34, 35, 36, 37 which are rotatably mounted in tailgate14. Apron 32 is also supported on a drive roll 38, rotatably mounted onmain frame 11. Although apron 32 passes between roller 21 on sledgeassembly 20 and idler roller 31, it is only in engagement with idlerroller 31 and not roller 21 which is located in close proximity to theapron belts and serves the purpose of striping crop material from thebelts, in addition to its bale forming function. Suitable means (notshown) are connected with drive shaft 28 to provide rotation of driveroll 38 in a direction causing movement of apron 32 along its path asindicated by arrows a and b in FIGS. 1 and 2. An additional guide roll40 in the main frame 11 ensures proper driving engagement between apron32 and drive roll 38. A pair of take up arms 41 (only one shown) arepivotally mounted on main frame 11 by a cross shaft 42 for movementbetween inner and outer positions shown in FIGS. 1 and 2, respectively.Take up arms 41 carry additional guide rolls 43, 44 for supporting apron32. Resilient means such as coil springs (not shown) are provided tonormally urge take up arms 41 toward their inner positions (FIG. 1)while resisting movement thereof to their outer positions (FIG. 2).

When the elements of round baler 10 are disposed in the condition shownin FIG. 1 with tailage 14 closed, an inner course c of apron 32 extendsbetween lower front guide roll 33 and idler roll 31. Rollers 21, 22, 23in this condition are inclined rearwardly on sledge assembly 20 todefine with course c the initial bale forming chamber, or as sometimesreferred to, the core starting chamber. Apron inner course c forms therear wall of the chamber while the inwardly facing moving peripheralsurfaces of rollers 21, 22, 23 define a rearwardly inclined cooperatingfront wall. Floor roll 18 generally defines the bottom of the chamberbetween the front and rear walls thereof, and starter roller 30 isspaced from floor roll 18 to provide a throat or inlet for the chamber,through which crop material is fed.

As round baler 10 is towed across a field, pickup tines 17 lift cropmaterial from the ground and deliver it through the throat formedbetween floor roll 18 and roller 30 and thence into the bale formingchamber of baler 10. The crop material is carried rearwardly by floorroll 18 into engagement with apron inner course c (FIG. 1) which urgesit upwardly and slightly forwardly into engagement with rollers 21, 22,23. In this manner crop material is coiled in a generally clockwisedirection as viewed in FIG. 1 to start a bale core. Continued feeding ofcrop material into the bale forming chamber by pickup tines 17 causesthe apron inner course c to expand in length around a portion of thecircumference of the bale core as the diameter increases. Take up arms41 rotate from their inner position shown in FIG. 1 toward their outerposition shown in FIG. 2 to provide for expansion of the inner course ofthe apron in a well known manner, i.e., in effect the outer course ofthe belts of apron 32 are diminished in length while the inner coursesincrease in a like amount. After a bale has been formed and wrapped withweb material, tailgate 14 is opened and the bale is ejected rearwardly.Subsequent closing of tailgate 14 returns the apron inner and outercourses of the belts of apron 32 to the locations shown in FIG. 1, andround baler 10 is ready to form another bale.

It will be understood that during formation of a bale, sledge assembly20 also moves between a bale starting position (FIG. 1) to a full baleposition (FIGS. 2 and 3). This movement of sledge assembly 20 causesidler roller 31 to move in an arcuate path while maintaining apron 32 inclose proximity to roller 21, thereby allowing roller 21 to strip cropmaterial from the belts of apron 32 and prevent or reduce significantlythe loss of crop material between roller 31 and apron 32 duringformation of a bale. Sledge assembly 20 is pushed outwardly towards itsfull bale position during bale formation as the crop material expandsagainst the rollers and is pulled inwardly by apron 32 to the positionshown in FIG. 1 during bale ejection without utilizing any additionalmechanisms.

In an alternative embodiment of the round baler 10 which is not shown,apron 32 could comprise a pair of chains connected together at spacedintervals by transverse slats, and the idler roller 31 would be replacedby a pair of idler sprockets engaged with the chains. Aprons consistingof chains and slats are well known in the prior art as substitutes forside-by-side belt aprons. Also in this alternative embodiment the guiderolls would be replaced with guide sprockets for engaging the apronchains, and the drive roll 38 would be replaced by a pair of drivesprockets.

Now turning to the bale wrapping system in which the present inventionis embodied, FIG. 1 shows a net dispensing mechanism 45 pivotallymounted on sledge assembly 20 and an interrelated cutting assembly 46(phantom outline) pivotally mounted between the side walls on main frame11. As best seen in FIG. 7, dispensing mechanism 45 comprises a pair oflevers 47, 48 spaced apart, inter alia, by a transverse idler roll 50,discussed in further detail below. Levers 47, 48 are rotatably supportedon a cross tube 51 that extends between arm 24, 25 of sledge assembly20. The dispensing mechanism 45 further comprises transverse clampingmembers 52, 53 (see FIG. 2) also extending between levers 47, 48 andarranged to dispense into the forming chamber web material s, such asnet or the like, from a supply roll 54 disposed in a container 55carried on the baler main frame 11. Container 55 has an access lid 56 toaccommodate the placement or removal of supply roll 54. Clamping members52, 53 may be mounted between levers 47, 48 by bars such as those shownin U.S. Pat. No. 5,036,642, issued Aug. 6, 1991, which clampingstructure and mounting arrangement are hereby incorporated by reference.Thus, as the web material s,s' is pulled from supply roll 54 via a slot57 and guided to clamping members 52, 53 of dispensing mechanism 45, itpasses under idler roller 50 which is mounted between and extendstransversely of levers 47, 48. Idler roller 50 is provided with netspreading elements 58, 60 affixed to the outer end portions thereof, andspiraled outwardly in a fashion whereby the net passing over idler roll50 is urged outwardly at the ends.

Referring now to FIGS. 2 and 3, the bale wrapping system also includesan electro-mechanical control system for sequentially actuating a netbrake (described in detail below) in conjunction with the net dispensingmechanism 45 as it is moved between a net feeding operative position, asshown in FIG. 3, and a nonoperative retracted position, as shown inFIGS. 1 and 2. This system also provides for proper actuation of the netcutting assembly 46 to avoid a premature release. To this end, anelectric actuator 61 is shown in its retracted position in FIGS. 1 and 2whereas in FIG. 3 it is shown in solid lines in its extended positionwhile the retracted position is shown in phantom outline.

Actuator 61 is pivotally mounted to plate 62, which is affixed to theouter surface of sidewall 63 of mainframe 11. A link member, 64,pivotally attached to actuator element 65, is pivoted about fixed pivotpin 66 between the retracted position shown in FIGS. 1 and 2 and theextended position shown in FIG. 3. Affixed to and adapted for rotationwith a pin 66 and inwardly of side wall 63 is lever 67 shown downwardlyinclined in FIGS. 1 and 2 in the non-actuated position of actuatedelement 65. A net dispensing actuator arm 68 is pivotally connected tolever 67 via pin 70 inwardly of wall 63, whereby actuator arm 68 movesto the upward position shown in FIG. 3 under conditions where actuatorelement 65 is extended. When actuator element 65 is retracted, arm 68 ismoved downwardly and net dispensing mechanism 45 is moved to theretracted non-operative position (FIG. 2).

Pivotally attached to the lower end of link member 64 is a transversecontrol arm 71 which reciprocates in a generally for and aft directionin response to the position of actuator element 65. The right end ofcontrol arm 71 is primarily supported by fixed flanged roller 72 andsecondarily supported by knife control roller 73 see FIGS. 5 and 6, bothof which extend through control arm slot 74. FIGS. 5, 6 and 8 showcontrol arm 71 in detail with FIG. 6 depicting conditions where actuatorelement 65 (not shown in FIGS. 5 & 6) is fully retracted, and FIG. 5showing control arm 71 and related elements in an intermediatecondition. Net cutting assembly 46 pivots around a fixed pivot via astub shaft 75 affixed to plate 76 secured to the inside surface of sidewall 63.

Secured in the intermediate area of control arm 71 is a ramp element 77having a ramp section 78 (FIG. 6) positioned to engage a roller 80secured to a leg member 69 which is integral with net brake control arm81. A slot 82 in brake control arm 81 cooperates with knife roller 73which is secured to knife side plate 83, which roller guides brake arm81 along a reciprocal path via slot 82. As shown generally in FIG. 3,brake arm 81 is in its lowermost position when actuator element 65 is inits extended position, and thereby lifts net brake element 84 from thesurface of the net supply roll by pivoting brake mounting arm 85counterclockwise around pin 86 (FIGS. 4 and 7). A counter roll 87 ispivotally mounted on a fixed bracket 88 via a counter roll mounting arm90 and continually held in contact with the surface of net supply roll54 by means of spring 91 which urges brake mounting arm 85 downwardlyand in turn also urges counter roll mounting arm 90 downwardly. Thenumber of rotations of roll 87 accurately determines the amount of netdispensed from roll 54. Thus, by counting the number of rotations of thecounter roll the desired length of net dispensed can be determined bythe known circumference of the bales being formed along with the desirednumber of wraps or fractional wraps.

FIG. 4, which shows the net supply assembly in general, illustrates theposition of brake element 84 and counter roll 87 when the net fromsupply roll 54' has been partially depleted. This unique arrangementdescribed in further detail below provides for continuous contactbetween net supply roll 54' and counter roll 87 without changing thespacial relationship between brake element 84 and the surface of the netroll, thereby providing for a substantially constant braking forceregardless of roll size.

Net cutting assembly 46 includes a pair of knife side plates 83 (onlyone shown) rotatably supported on stub shaft 75. A knife 92 (onlypartially shown in FIG.8) is carried by and extends transversely betweenknife side plates 83 for engagement with the net material dispensed bydispensing mechanism 45. A similar net cutting assembly that operates inthe same general manner is shown in U.S. Pat. No. 5,036,642. For thepurposes of this invention it is believed that the diagrammatic outlineshowing a cutting assembly in various positions will suffice.

Turning again to the net supply assembly set forth in FIGS. 3 and 7,details of the present invention are more specifically shown in FIGS. 9,10, 11 and 11a. A partially depleted net supply roll 54' is mounted forrotation about a shaft 93 supported by bracket 88. It should be pointedout that shaft 93 extends through supply roll 54' and is supported by abracket similar to bracket 88 at its opposite end. For the purposes ofthis description reference will only be made to the elements shown inFIGS. 9 and 10 and in those instances where like or similar elements areutilized at the other side of the assembly it will be presumed to beself evident. In this regard, in the description material hereinabovedirected to FIG. 7 the same reasoning was used.

Net brake control arm 81 is depicted in the downwardly extended positionin FIGS. 9 and 10, i.e., roller 80 is fully engaged by ramp element 77.Brake mounting arm 85 is pivotally secured to control arm 81 by a pin 89and urged downwardly by spring 91, which also holds counter roll 87against supply roll 54'. Counter roll 87 is mounted on counter rollmounting arm 90 via a stub shaft 95, which arm 90 is pivotally mountedon bracket 8 by a pivot pin 96, and thus when arm 81 is held in itsdownwardly extended position spring 91 urges brake mounting arm 85clockwise about pivot pin 89 and in so doing pulls counter mounting arm90 in the same direction about pin 96 by virtue of interconnectingpivotal engagement at pin 86.

An electronic sensor 97, mounted on arm 90 by mounting bracket 98, isdisposed adjacent the path of a permanent magnet 100 adapted to passsensor 97 and emanate a magnetic signal each time counter roll 97rotates. This electronic signal is used to count the rotations ofcounter roll 87 which in turn is directly proportional to thecircumference of the roll which is held in frictional contact with thenet. Thus, the number of rotations of counter roll 87 is directlyproportional to the net being fed from supply roll 54' to the netdispensing mechanism.

Brake element 84, mounted on brake mounting arm 85 by a pin 101,comprises a rigid transverse bar 102 and an integral transverse flange103 extending outwardly therefrom in a generally radial direction.Secured to flange 103 is a flexible outer sleeve 104 enclosing bar 102.Sleeve 104, which is shown continuous along bar 102 but could comprise aseries of side-by-side like elements for ease of assembly, is readilydeformable against bar 102 (see FIG. 11a) when element 84 is urgeddownwardly into the operative position. The material used for sleeve 104provides a frictional contact with the net in the engaged position alongthe full width of supply roll 54' regardless of irregularities of thesurface and the size of the roll.

The operation of baler 10 will be described by first turning to thepoint at which bale B has been formed and it is ready to be wrapped withnet material, electric actuator 61 is activated while apron 32 continuesto rotate bale B in a clockwise direction as viewed in FIG. 2. The outersurface of bale B is generally illustrated by heavy broken lines 93 inFIGS. 2 and 3. Actuator element 65 of electric actuator 61 drivescontrol arm 71 from left to right and net dispensing actuator arm 68from the position shown in FIG. 2 to the position shown in FIG. 3. Thisrotates the dispensing mechanism 45 from the position shown in FIG. 2 toposition shown in FIG. 3. As the dispensing mechanism 45 moves towardits dispensing position (FIG. 3), the cutting assembly 46 is rotatedclockwise to the non operative position shown in FIG. 3 and clampingmembers 52, 53 move into the gap between roller 21 and apron 32.Meanwhile, net brake element 84 has been removed from the surface ofsupply roll 54 while counter roll 87 is maintained in operative contacttherewith permitting the tail of the net material gripped betweenclamping members 52, 53 to be fed out and inserted through the gap intothe bale forming chamber. The tail is dragged downwardly by frictionalcontact with the outer surface of bale B and ultimately caught in thenip between roller 21 and bale B which are rotating in oppositedirections. The net material is then dispensed along a path from thesupply roll 21 via slot 57, around idler roller 50, between clampingmembers 52, 53, and then through the gap into the bale forming chamberwhere it is wrapped circumferentially around bale B while the balecontinues to be rotated by apron 32. Counter roll 87 maintains lightcontinuous contact with the surface of supply roll 54, at all times,thus permitting a minimum drag during dispensing and an accurate countof the number or fractional number of rotations of roll 87.

After bale B has been wrapped with one or more layers of the netmaterial (usually 2 to 4 wraps), electric actuator 61 is reversedthereby moving dispensing mechanism 45 from the position shown in FIG. 2to the position shown in FIG. 3. When dispensing mechanism 45 has beenretracted, net cutting assembly 46 is rotated counterclockwise (FIG. 6)so that knife 92 is brought downwardly at the appropriate time intocontact with the expanse of net material extending from clamping members52, 53 of dispensing mechanism 45 to the periphery of roll 21. Morespecifically, knife side plates 83 rotate about stub shaft 75 underconditions where knife control roller 73 slides upwardly in brake armslot 82 upon reaching the ramp 94 in slot 74 in transverse control arm71. Knife 92 cuts the net material in a known manner and leaves asucceeding tail which is gripped by clamping members 52, 53 for futureinsertion into the bale forming chamber when the next bale is ready tobe wrapped with net material. Prior to cutting, the net brake has beenactuated by control arm 81 which travels upwardly via slot 82 when ramp78 is clear of roller 80, which actuation permits braking force (alsoreferred to as drag) to be applied on the net resulting in necessarytension during cutting.

Now turning to the unique relationship of the elements of the net supplyassembly with particular focus directed to the manner by which brakeelement 84 and counter roll 87 interrelate to provide improved reliableresults. Counter roll is held in continuous contact with the surface ofthe supply roll regardless of its amount of depletion. This enhances thefeeding function and prevents back lash as well as the need for accuracyin the counting function which necessitates continuous slip-free contactbetween the counter roll surface and the net as it is fed from thesupply assembly.

Equally as important is the need for selectively increasing net tensionto a consistently predictable force level and duration. Brake element 84is poised in its non-contact position at a constant distance regardlessof net depletion. When engaged, element 84, comprising a unique outersleeve 104, is adapted to provide a uniform drag or braking force acrossthe full transverse expanse of the net for proper cutting. By varyingspring force of spring 91 this drag can be varied to any desired amountnecessitated by the type of web material being used for wrapping. Forexample, the net's flexibility, durability and/or frictional coefficientall have a bearing on the amount of braking force desirable to provideeffective wrapping. In some instances, depending upon the net materialbeing used and the crop material being baled, it has been found to bedesirable to reroute the net path so that the supply roll feeds outwhile rotating clockwise as opposed to counterclockwise, as shown. Inthis situation the net path is sinuous or generally S-shaped as itpasses from the supply roll to the counter and thence out slot 57. Thisvariation of the supply assembly of the present invention is readilyadaptable to serve the same improved function of the net wrappingapparatus.

While the preferred structure in which the principles of the presentinvention have been incorporated is shown and described above, it is tobe understood that the invention is not to be limited to the particulardetails, as shown and described above, but that, in fact, slightvariations of the type referred to above or widely different means maybe employed in the practice of the broader aspects of the invention.

Having thus described the invention, what is claimed is:
 1. In a roundbaler having a chamber in which cylindrical bales of crop material areformed,a net supply assembly including means for receiving a roll ofnet, dispensing means having an operative condition during which net fedfrom said supply assembly is dispensed into said bale chamber forwrapping a bale formed in said chamber whereupon the diameter of saidroll of net is reduced, means defining a path through which said net isfed from said roll to said dispensing means, means for severing said netafter it has been wrapped around said bale, control means operablyconnected to said net supply assembly and said severing means so thatsaid net is restrained from further feeding from said net supplyassembly under conditions where said bale has been wrapped and saidmeans for severing is operative, the improvement comprising net brakingmeans coupled to said control means and comprising a transverse brakeelement having operative and inoperative positions corresponding to saidoperative condition of said severing means and said operative conditionof said dispensing means, respectively, a mounting assembly includingmeans for mounting said transverse brake element for bearing against thenet on the outer surface of said roll of net in said operative positionto restrain said net from being fed, and means for maintaining saidtransverse brake element at a predetermined distance from the surface ofsaid roll, regardless of the varying diameter of said supply roll as itis being reduced while net is being fed therefrom, under conditionswhere said transverse brake element is in said inoperative position. 2.A round baler as set forth in claim 1 whereinsaid net supply assemblyfurther comprises an idler roll for maintaining minimal drag on the netas it is being dispensed, and said mounting assembly further includesmeans for mounting said idler roll in operative contact with the net onthe outer surface of said supply roll for rotation at a peripheral speedthe same as the speed of the net being dispensed from said supply roll.3. A round baler as set forth in claim 2 wherein said mounting means forsaid idler roll comprisesa pair of lever arms between which said idlerroll is mounted for rotation, said lever arms pivotally mounted, andmeans for pivotally urging said lever arms to maintain said idler rollin said operative contact with the outer surface of said supply roll.